Experiments on the synthesis of element 107

Results are presented of experiments on the synthesis of the 107th element. Bombardment of /sup 209/Bi by /sup 54/Cr has revealed new spontaneously fissioning emitters with half-lives approx.5 sec and approx.2 msec. Different control experiments using the crossing-reaction method give grounds for assuming that activity with T/sub 1///sub 2/ approx.5 sec is due to the spontaneous fission of the isotope /sup 257/105, which is formed as a result of the ..cap alpha.. decay of the isotope /sup 261/107, which has a half-life of about 2 msec in a noticeable fraction of the events (approx.20%) and experiencing spontaenous fission. (AIP)